Edward blass



(No Model.) 2 Sheets-Sheet 1.

E. BLASS.

STEAM BOILBR.

No.f456,689. Patented July 28, 1891.

`O @ooo como 0 2 Sheets-Sheet 2.

E. BLASS.

STEAM BOILBR.

(No Model.)

No. 456,689. Patented July 28, 1891.

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Zilla UNITED STATES PATENT rrlcn.

EDVARD BLASS, OF ESSEN-ON-TIIE-RUHR, GERMANY.

STEAM-BOILER.

SPECIFICATION 'forming part of Letters Patent No. 456,689, dated July 28, 1891.

Application iiled October 8, 1890. Serial No. 367,430.

(No model.) Patented in Germany July 15, 1888, No. 45,935, and in England November 29, 1888, No. 17,412.

To all w12 om it may concern,.-

Be it known that I, EDWARD BLAss, a subject of the Emperor of Germany, residing at Essen-onthe-Ruhr, Prussia, have invented an Improvement in Steanroilers, (for which Letters Patent have been granted in Germany, dated July 15, 1888, No. 45,935, and in Great Britain, dated November 29, 1888, No. 17,41%) of which the following is a specification.

This invention relates to steam -boilers which comprise a part containing a lire-box and one or more parts provided with tubes; and it consists in a separate water-jacket lined With fire-brick and forming the back flue of the boiler, there being a pipe for the supply of Water to run through such jacket into a trough over the fine.

In the drawings, Figure 1"is a longitudinal vertical section, and Fig. 2 a transverse section on line l 2, Fig. 1, of two boilers, each composed of the tire-box partA and the tubular part B. C is the flue connecting together the partsA and B. The said iiue consists in an inner Wall of iire-brick or other fire-proof material and a shell D E of sheet metal, the part D of the latter forming a Waterejacket, which incloses the said Wall at the sides and the bottom, while the part E forms a trough covering the wall at the top. Into the jacket 1) Water is introduced at o., and it ilows out of the same into the trough E at b.

Fig. 3 shows in section a Water-jacket D', consisting in a row of juxtaposed tubes through which Water is caused to circulate in like manner as through the shell D. The said tubes are preferably inclosed by an outer shell of sheet metal.

Fig. 4. represents a water-jacket D, applied to a flue O,Which connects together the parts A and B of a single boiler, the jacket extending in this case over the whole back of the The protecting-shell may also consist in a single sheet-metal Walhabove which are arranged perforated Water-pipes, by means whereof Water is caused to How over and along the shell in View of cooling it.

The lire-proof material may be secured to the shell by screws or bolts, Whose heads are protected by the former. Thus Fig. 5 shows an arrangement for fastening' bricks (l to the shell by means of screws having their heads sunk into recesses of the bricks, the said recesses being subsequently lilled up with fireproof clay. It the inner part of the iiueis to consist in a layer ot' clay applied to the shell, the construction shown byFig. b' is available. in which the clay is represented as a layer inclosing bolts screwed into the metal. According to Fig. T, the connection between the bricks d and a waterjacket shell is established by bolts passing through tubes c, which traverse the jacket andare fixed in the walls thereof.

I claim as my invention-- 1. The combination, with a boiler havinga re-box and return-dues, of a back fine having a lining ot' 1ire-brick, and a double shell of sheet metal surrounding the same and forming a Water-jacket separate from the boiler, and a pipe for supplying water to run through such jacket, substantially as .speciiied 2. The combination, With a boiler having a firebox and return-lines, of a back flue having a lining of fire-brick, and a double shell of metal surrounding the same and forming a Watenjacket separate from the boiler, and a pipe for supplying Water to run through such jacket, and a trough over the fine, substantially as specified.

Signed by me this 2d day of October, 1890.

f EDWARD BLASS.

Witnesses:

WM. DOUGLAS MOORE,

JAMES G. MCMURRAY. 

